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thionic acid

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noun Chemistry.

any of the five acids of sulfur of the type H2SnO6, where n is from two to six.

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“Evoke” and “invoke” both derive from the same Latin root “vocāre.”

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Origin of thionic acid

First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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